ipdata is a free and open-source ip address lookup system. It combines the results retrieved from multiple maxminddb databases to provide you general geo/isp data for version 4 addresses. The project is available in three forms, the Golang library `ipdata` which can easily be used in your own Go projects, a public API endpoint (more info: https://ipdata.info), and a public Docker image on DockerHub (see: https://hub.docker.com/r/s32x/ipdata/).